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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmVariableWatch.h"
#include <memory>
#include <utility>
#include <vector>
static const char* const cmVariableWatchAccessStrings[] = {
"READ_ACCESS", "UNKNOWN_READ_ACCESS", "UNKNOWN_DEFINED_ACCESS",
"MODIFIED_ACCESS", "REMOVED_ACCESS", "NO_ACCESS"
};
const char* cmVariableWatch::GetAccessAsString(int access_type)
{
if (access_type < 0 || access_type >= cmVariableWatch::NO_ACCESS) {
return "NO_ACCESS";
}
return cmVariableWatchAccessStrings[access_type];
}
cmVariableWatch::cmVariableWatch() = default;
cmVariableWatch::~cmVariableWatch() = default;
bool cmVariableWatch::AddWatch(const std::string& variable, WatchMethod method,
void* client_data /*=0*/,
DeleteData delete_data /*=0*/)
{
auto p = std::make_shared<cmVariableWatch::Pair>();
p->Method = method;
p->ClientData = client_data;
p->DeleteDataCall = delete_data;
cmVariableWatch::VectorOfPairs& vp = this->WatchMap[variable];
for (auto& pair : vp) {
if (pair->Method == method && client_data &&
client_data == pair->ClientData) {
// Callback already exists
return false;
}
}
vp.push_back(std::move(p));
return true;
}
void cmVariableWatch::RemoveWatch(const std::string& variable,
WatchMethod method, void* client_data /*=0*/)
{
if (!this->WatchMap.count(variable)) {
return;
}
cmVariableWatch::VectorOfPairs* vp = &this->WatchMap[variable];
cmVariableWatch::VectorOfPairs::iterator it;
for (it = vp->begin(); it != vp->end(); ++it) {
if ((*it)->Method == method &&
// If client_data is NULL, we want to disconnect all watches against
// the given method; otherwise match ClientData as well.
(!client_data || (client_data == (*it)->ClientData))) {
vp->erase(it);
return;
}
}
}
bool cmVariableWatch::VariableAccessed(const std::string& variable,
int access_type, const char* newValue,
const cmMakefile* mf) const
{
auto mit = this->WatchMap.find(variable);
if (mit != this->WatchMap.end()) {
// The strategy here is to copy the list of callbacks, and ignore
// new callbacks that existing ones may add.
std::vector<std::weak_ptr<Pair>> vp(mit->second.begin(),
mit->second.end());
for (auto& weak_it : vp) {
// In the case where a callback was removed, the weak_ptr will not be
// lockable, and so this ensures we don't attempt to call into freed
// memory
if (auto it = weak_it.lock()) {
it->Method(variable, access_type, it->ClientData, newValue, mf);
}
}
return true;
}
return false;
}
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